4

Pregnancy:
If a person has a period of normal duration and flow, then even if it was early, it is incredibly unlikely that the person is pregnant. Pregnancy requires the cessation of periods to develop the baby.
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6

Maybe:
Yes, you can get pregnant 2 months after a miscarriage. You can have implantation bleeding around the time of implantation which may be 5-7 days after fertilization. But you will not have implantation the day after sex if that's when you got pregnant!
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8

No:
Pregnancy is a good contraceptive. Sex during any type of pregnancy will not get you pregnant. Miscarriage is not caused by having sex. You can have bleeding from sex during pregnancy but not miscarriage. Blighted ovum is not caused by sex.
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11

Pregnancy test:
If you think you might be pregnant check then check a home pregnancy test. They are cheap, reliable and available at any pharmacy. The best time will be after you miss your period.
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12

No more, no less:
In general, having a first baby does not, by itself, make a woman more or less fertile than she was before. However, it's important to remember that fertility decreases progressively as age increases; how much and how fast will depend on age at the time of delivery, how much time passes before trying to get pregnant again, and whether other fertility factors arise in the meantime.
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13

Probably not:
It is unlikely if you have completely expelled the previous pregnancy that was a blighted ovum as Mother Nature will not reset the pituitary gland for another ovulation until the HCG levels drop from an existing pregnancy.
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14

Only one surge :
Only one lh surge happens in a cycle. If you are using lh predictor kits the test only turn positive when the lh level reaches a certain concentration. If you are getting positive and negative test then the levels may be fluctuating in and out of the tests detection.
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19

Unclear, but...:
The specifics & relevance of your concerns are not clear enough to deduce diagnosis. But, still do HPT in 7-10 days after missing period and repeat it in another 7-10 days if the first HPT is (-) & still in doubt. And it is useful to know that ovulation occurs some 2 weeks before period disregarding personal menstrual cycle. More? Seek evaluation & counseling.
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